混凝土坝裂缝转异诊断的顺序典型小概率法

Order typical small probability diagnosis method of concrete dam crack behavior abnormality

裂缝是混凝土坝不可避免的病害,其稳定与否是关系到混凝土坝结构安全的关键因素.基于裂缝开度与裂缝尖端张开位移之间的函数关系,提出了混凝土坝裂缝转异诊断的临界裂缝开度准则,并探讨了该准则所需的裂缝尖端张开位移和裂缝亚临界扩展量的确定方法.借助裂缝开度监控模型将临界裂缝开度准则进行转化,并与大坝安全监控中裂缝的原位监测资料-裂缝开度联系起来,建立了混凝土坝裂缝转异诊断的顺序典型小概率法.实例分析表明,顺序典型小概率法实现了临界裂缝开度准则在大坝安全监控中的具体应用,是合理可行的.

Cracks in concrete dams are inevitable disease and whether they are stable or not is a key factor relating to the structural safety of the concrete dams. According to function relationship between crack opening and crack tip opening displacement, critical crack opening criterion of concrete dam crack abnormality diagnosis was proposed. The determining method of crack tip opening displacement and crack subcritical extension amount needed by the critical crack opening criterion was investigated. The critical crack opening criterion was transformed by using of crack opening monitoring model and associated with the crack in situ monitoring data in dam safety monitoring, crack opening to establish the order typical small probability diagnosis method of concrete dam crack behavior abnormality. The case study shows that the order typical small probability diagnosis method implement specific application of critical crack opening criterion in dam safety monitoring, and it is reasonable and feasible.